Here's a look behind-the-scenes at last night's Twitter show – featuring Martha Stewart, Newark Mayor Cory Booker, Jack Dorsey and Biz Stone. It's what happened before they stepped foot on set with Piers Morgan – primarily, a lot of tweeting.

Rod Stewart will be Piers Morgan's guest on "Piers Morgan Tonight" this evening, and the duo talked about life, love and Stewart's new baby.

But Stewart also took a trip down memory lane, and relayed several stories from the road. It included drinking and drugs, of course, but that was the beginning. "We would dangle our Holiday Inn key in front of the girls," said Stewart. "And they'd all be back at the hotel." And then there was the trashing of the hotel rooms after. And which group name did Stewart start checking in under after hotels started catching on? Check out the clip above.

On last night's interactive, live, studio audience special edition of "Piers Morgan Tonight," Piers Morgan interviewed the founders of Twitter, Jack Dorsey and Biz Stone, as well as several notable tweeters. One is Newark Mayor Cory Booker, who gained fame when he personally helped his residents deal with a massive snowstorm by fielding requests on Twitter. "It was a democratizing force," Booker told Piers. "We actually could now talk directly to our residents, thousands of them."

Below, find clips from Alyssa Milano as well as Jack and Biz... FULL POST

Martha Stewart was a guest on her "PIers Morgan Tonight"'s live interactive Twitter show. She told Piers Morgan she spends just five minutes a day tweeting – as opposed to Piers, who said he spends just five minutes not tweeting.

"I find that is a sufficient amount of time to get across the messaging I'd like," said Stewart. "After awhile you'll get used to it and you're going to figure out what it is good for, and it is good for a lot of things."